Arizona, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Gilbert, AZ

September is the extension of the hot summer season in Gilbert, with an average range between 70°F (21.1°C) to 99°F (37.2°C). The temperatures are low compared to the peak of the summer, but it is still very hot as most of the days cross 100°F (37.8°C). The days are sunny and bright with about 11 hours of sunlight. Nights are usually warm and rarely drop below 65°F (18.3°C).
September is usually calm with the average wind speed around 6mph (9.7km/h). Stargazing activities are one of the largest beneficiaries of the clear skies, a lack of tall buildings, and the presence of the Gilbert Centennial Rotary Observatory in Gilbert.
  • The average high temperature in September: 37.8°C

The warmest month (with the highest average high temperature) is July (41.7°C).
Months with the lowest average high temperature are January and December (19.4°C).

  • The average low temperature in September: 21.1°C

The month with the highest average low temperature is July (25°C).
The coldest month (with the lowest average low temperature) is December (4.4°C).

  • The average rainfall in September: 22.6mm

The wettest month (with the highest rainfall) is March (30.2mm).
The driest month (with the lowest rainfall) is June (1mm).

  • The average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 14.5h).
Months with shortest days are January and December (Average daylight: 10h).